In our reasonings concerning matter of fact, there are all i... - David Hume, An Enquiry Concerning Human Understanding

"Indulge your passion for science…but let your science be human, and such as may have a direct reference to action and society. Be a philosopher; but amidst all your philosophy, be still a man."

"In our reasonings concerning matter of fact, there are all imaginable degrees of assurance, from the highest certainty to the lowest species of moral evidence. A wise man, therefore, proportions his belief to the evidence."